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Monday, July 28, 2008Hybrid prism diagonal
Sometimes combining two features into one product is a good idea and, well, sometimes not. What do get when you cross a 90 degree mirror star diagonal with a 45 degree erecting prism, for instance?
A star diagonal uses a mirror, which tends to maintain good image quality and sets the eyepiece on a telescope at a comfortable 90 degrees for viewing objects high overhead. Only penalty is that images are reversed right to left - not a big deal and most users find it easy to make the adjustment. This is the standard diagonal uses and supplied with most telescopes. For daytime work, most users prefer the correct right to left images provided by an erecting prism, which also sets the eyepiece at a more comfortable 45 degree position for viewing objects over land, but at the price of reduced image sharpness and quality. So what happens when you combine a 90 degree angle for astronomy with an erect image prism? Answer: you get an telescope accessory that degrades image quality and a daytime accessory that is a pain in the neck to use. Comments: |
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